Does the husband have to pay for his wife's qurbani, or is she legally responsible to pay for herself in hajj?

Qurbani is obligatory on every Muslim regardless of their gender be it male or female they have to perform this sacred act in order to prove of their submission to ALLAH’s will and command. Everyone has to pay for their qurbani animal if they have reached puberty. However, it is the husband or father who can pay for their wife and children (not reached puberty) respectively.

If wife doesn’t have the required amount i.e. 613.35 grams of silver or any kind of wealth which is equivalent to it then it affirms that she is solely dependent on his husband for her maintenance and thus husband should pay for her wife’s qurbani. Similarly, it is with the children who are still looked after by their parents i.e. they are dependent but have reached the age of puberty then also father can perform the same role aforementioned for the husband. Father or husband, if they both can afford the expense of another qurbani other than their own, can perform this act on behalf of the dependent wife and his children. For this he will be definitely rewarded as it is his right to safeguard and take responsibility of them all.

Similar would be the case with the couple at Hajj where it is also permissible while performing qurbani that if wife is sahib-e-nisaab i.e.  She is wealthy enough to pay for her qurbani animal then she should do so. Otherwise it will not be wrong if asks of her husband to perform qurbani on her behalf as well.

It is thus concluded that qurbani cannot be neglected in any case except the conditions which make the laws lenient and easy-going when a Muslim cannot perform qurbani or when he wants to perform but is unaware of the rules that are to be followed prerequisite to qurbani at Hajj or simply at his own place.
Resource by Pak Qurbani.